Me and my boyfriend had protected sex for the second time and we used protection and everything, only vaginal, no anal or anything. We are eachothers first partners, and neither of us have STDs. Couple days after the intercourse, i felt stinging and burning vaginal pains when i urinated and some drops of blood would follow as well. I also had to urinate again after about two minutes after the first time but not much came out. My bf was also fingering me earlier and that hurt a little. Is this because of the sex, or do i have some type of infection???